Boiler



G. SURPRENANT BOILER Filed sept. 12, 1930 Sept.' 6, 1932.

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I l I l 1 n l l n l 1 u l f n Patented Sept. 6, Y1932 UNITED STATES PATENT oFFlcE GEORGE SURPRENANT, F ROTTERDAMIEW YORK IBOILER Application inea september 12j, 1930. serian No. 481,432.l

reference to the accompanying drawing, in

which I have illustrated a preferred embodiment of my invention, andin which Fig. l is a vertical section through the boiler, and Fig. 2 is a sectional plan view taken along the line 2 2 of Fig. 1.

Like reference characters indicate like parts throughout the drawing.

Referring now to the drawing, 10 is a water space of the boiler defined by side walls, 11, end walls, 12, an upper tube sheet, 13, which is secured to the side and end walls by any process of assembling, for example, by rivets, 14, to form a water-tight joint, a lower tube sheet, 15, spaced from said upper tube 204 sheet which also forms a water-tight joint with the side and end walls of the boiler and, in the embodiment illustrated, with a vertically disposed plate, 16, which, in turn, forms j a water-tight joint, 17, with a bottom plate, 18, which, in turn, is oined by a water-tight connection to the side walls and to the front end wall. 1

The front end of the bottom plate, 18, which may be spaced above the foundation as indicated, may be supported on legs, 19. A base plate, 20, is located beneath the lower tube sheet, 15.

The boiler is provided with a furnace, 21, which is fired, in the embodiment illustrated,

"' by an oil burner, 22, which isV illustrated as a jet type or what is commonly known as a cannon type of burner, and which projects through the front end wall, 12, of the boiler and through the front wall, 191, of the furnace, the space between the tubular burner and the opening through which it extends being filled with any suitable material.

The lower wall, 192, of the furnace is pro- 45., vided with an opening, 23, and the lower plate, 18, is provided with a registering opening, 24', an annular member, 25, being inserted through the two openings and being welded or otherwise secured both to the bottom wall, 192, of the furnace and the plate, 18, to form a water-tight joint. The opening formed in the annular member, 25, is normally closed by a cover plate, .26. If it is desired to use a spinner "type oil burner, it is preferablyI mounted within the opening formed in the annular member, 25, and in a vertical position, in which case the burner, 22, would be removed andthe opening in which it is located closed.`

The furnace is supported in position by a first section, 27, of fire tubes, the upper and lower ends of which aresecured, as by expanding or welding, inopenings in the tube sheet, 13, and the upper wall, 193, of the furnace, respectively, the gases from the furnace passing upwardly through the first section of tubes. The furnace is prevented from lateral movement by stay bolts, 37, secured tothe side walls, 11, and the side walls of the furnace. The fire tubes, 28, of a second sec-` tion `are expanded vor otherwise securedin openings in the tubey sheet, 13, and in the lower tube sheet, 15, respectively. A space, 29 is provided beneath the lower tube sheet, 15,

through `which the gases pass, after flowing downwardly through the tubes, 28, of the second section to the stack, 30, the lower end of which passes through the tube sheet, 15, as illustrated.- The inlets and outlets to the boiler are `indicated at 38 and 39, respectively.

The side walls, 11, Vand the end walls, 12, of the boiler are preferably extended upwardly above the tube sheet, 13, as at 31, and a cover plate, 32, is suitably secured over such Y upward extensions. The cover plate,32, is preferably provided with an. o ening, 33, which is adapted to receive a readily removable cover, When the cover, 34, is removed, the opening, 33, provides access to the upper ends of the sections, 27 and 28, of the fire tubes, through which opening any accumulation `of dust or other foreign material may readily be cleaned from the space above ,I

the lire tubes and the tubes. f

The lower portion, 301, of the stack, 30 is normally surrounded by water in the boiler, 9

and an intermediate portion thereof, 302, between the cover plate, 32, and the tube sheet, 13, is exposed to the hot furnace gases in the space between the cover plate and the upper tube sheet. Y

A grate, 35, is preferably provided beneath the lower tube sheet, 15, for the reception of refuse which may be inserted through a door, 36, and on which such refuse may be incinerated. Y

l have foundin practice that in starting the boiler cold, the heating of the section, 302, of the stach by the gases to which it is exposed creates a draft sufficient to draw the gases upwardly through the first section of fire tubes, 27,k and downwardly through the second section of fire tubes, 28, through the space, 29, and into the stack, 30.v By surrounding the lower portion of the stack with boiler water in the manner illustrated, the heating of the stack thus surrounded with the boiler water further promotes suction in the stack and further assists in inducing a flow of gases through the first and second sections of the fire tubes. l

l have also found in practice that the space, 29, beneath the lower tube sheet, l5, with the grate, 35, provides a convenient incinerator for refuse or other material.

rThe operation of the boiler embodying my invention will readily be"understood'froin the foregoing description, and is as follows:

, Assuming that the boiler is cold, when the fire is started in the furnace, the gases passing upwardly hrough the fire tubes and into thespace between the cover plate, B2, and the upper tube sheet, 13, and which surround the portion '302 of the stack, heatthe stack to produce a sufficient suction to induceY a downward flow `Vof the hot gases through the second section, 28, of the fire tubes and into the lower portion of the stack.

The water surrounding the portion 301 of the stack further heats the gases therein which, together with the heatedY portion 302 of the stach, draws the furnace gases upwardly through the iirstsectionof boiler tubes and downwardly through the second Vsection of boiler tubes into the stack.

Y ln case it is desired to incinerate material, 1t is inserted through the door, 36, into the space, 29. l have found in practice that the hot gases passing through the first sec tion Vof fire tubes, 28, and through the material, and thence into the stack, 82, effectively consume the material.

l/Vhile l have described Amy invention in its preferred embodiment, it is to be understood that the words which I have used are words of description and not of limitation and that changes within the scope of the app-ended claims may be made without departing from the true scope and spirit of my invention in its broader aspects.

lWhat l claim is l, In combination, a furnace, a steam boiler comprising an up-pass for gases from said furnace and a down-pass communicating with said rip-pass, the gases through said passes engaging boiler heating surface,

tube sheet, respectively, and through which Ytop wall of said furnace. and into said upper Y the gases iiow upwardly, a second section of fire tubes through which the gases flow downwardly, a space being provided above said first and second/sections,` and a stack communicating with the lower ends of said second section of lire tubes and having a portion surrounded by boiler water and another portion passing through said space and exposed to the'hot gases.

' GEORGE SURPRENANT. 

